Abstract

Passive harmonic-mode locking of erbium-doped fiber laser with atomic multilayergraphene is presented. The laser could operate at several harmonics (from 2nd to 21st) of the fundamental repetition frequency of the ring resonator (106 MHz). The highest achieved repetition rate was 2.22 GHz (which corresponds to the 21st harmonic) with sub-picosecond pulse durations and over 40 dB of the supermode noise suppression. The saturable absorber was formed by multilayergraphene, mechanically exfoliated from pure graphite block through Scotch-tape and deposited on the fiber ferrule.

Received 03 January 2012Accepted 31 March 2012Published online 20 April 2012

Acknowledgments:

The work presented in this paper was supported by the statutory funds of the Institute of Telecommunications, Teleinformatics and Acoustics, Wroclaw University of Technology, under the Grant No. S10132. The authors are very thankful to Tespol Sp. z o.o. for providing the Tektronix 12.5 GHz oscilloscope and essential support in this work.